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[Clang] Add predefined macros for integer constants (llvm#123514)
This adds predefined macros for integer constants to implement section 7.18.4 of ISO/IEC 9899:1999 in `<stdint.h>` in a safe way: ``` __INT8_C(c) __INT16_C(c) __INT32_C(c) __INT64_C(c) __INTMAX_C(c) __UINT8_C(c) __UINT16_C(c) __UINT32_C(c) __UINT64_C(c) __UINTMAX_C(c) ``` Which improves compatibility with GCC and makes it trivial to implement section 7.18.4 of ISO/IEC 9899:1999. Clang defines `__INT<N>_C_SUFFIX__`, `__UINT<N>_C_SUFFIX__`, `__INTAX_C_SUFFIX__` and `__UINTMAX_C_SUFFIX__`, but these macros are useless for this purpose. Let's say, for example, that `__INT64_C_SUFFIX__` expands to `L` or `LL`. If the user defines them as a macros, the compiler will produce errors if `INT64_C` is implemented in `<stdint.h>` using `__INT64_C_SUFFIX__`: **minimal-test.c:** ```cpp #if defined(__clang__) & !defined(__INT64_C) # pragma clang diagnostic push # pragma clang diagnostic ignored "-Wreserved-identifier" # define __PSTDC_INT_C_(literal, suffix) literal##suffix # define __PSTDC_INT_C(literal, suffix) __PSTDC_INT_C_(literal, suffix) # define INT64_C(literal) __PSTDC_INT_C(literal, __INT64_C_SUFFIX__) # pragma clang diagnostic pop #elif defined(__GNUC__) # define INT64_C __INT64_C #endif typedef __INT64_TYPE__ int64_t; #define L "Make Clang produce an error" #define LL "Make Clang produce an error" int main(int argc, char **argv) { (void)argc; (void)argv; int64_t v = INT64_C(9223372036854775807); (void)v; return 0; } ``` <img width="697" alt="imagen" src="https://github.com/user-attachments/assets/6df97af6-7cfd-4cf9-85b7-d7c854509325" /> **test.c:** ```cpp #if defined(__clang__) && !defined(__INT8_C) # pragma clang diagnostic push # pragma clang diagnostic ignored "-Wreserved-identifier" # define __PSTDC_INT_C_(literal, suffix) literal##suffix # define __PSTDC_INT_C(literal, suffix) __PSTDC_INT_C_(literal, suffix) # define INT8_C(literal) __PSTDC_INT_C(literal, __INT8_C_SUFFIX__) # define INT16_C(literal) __PSTDC_INT_C(literal, __INT16_C_SUFFIX__) # define INT32_C(literal) __PSTDC_INT_C(literal, __INT32_C_SUFFIX__) # define INT64_C(literal) __PSTDC_INT_C(literal, __INT64_C_SUFFIX__) # define INTMAX_C(literal) __PSTDC_INT_C(literal, __INTMAX_C_SUFFIX__) # define UINT8_C(literal) __PSTDC_INT_C(literal, __UINT8_C_SUFFIX__) # define UINT16_C(literal) __PSTDC_INT_C(literal, __UINT16_C_SUFFIX__) # define UINT32_C(literal) __PSTDC_INT_C(literal, __UINT32_C_SUFFIX__) # define UINT64_C(literal) __PSTDC_INT_C(literal, __UINT64_C_SUFFIX__) # define UINTMAX_C(literal) __PSTDC_INT_C(literal, __UINTMAX_C_SUFFIX__) # pragma clang diagnostic pop #else # define INT8_C __INT8_C # define INT16_C __INT16_C # define INT32_C __INT32_C # define INT64_C __INT64_C # define INTMAX_C __INTMAX_C # define UINT8_C __UINT8_C # define UINT16_C __UINT16_C # define UINT32_C __UINT32_C # define UINT64_C __UINT64_C # define UINTMAX_C __UINTMAX_C #endif typedef __INT8_TYPE__ int8_t; typedef __INT16_TYPE__ int16_t; typedef __INT32_TYPE__ int32_t; typedef __INT64_TYPE__ int64_t; typedef __INTMAX_TYPE__ intmax_t; typedef __UINT8_TYPE__ uint8_t; typedef __UINT16_TYPE__ uint16_t; typedef __UINT32_TYPE__ uint32_t; typedef __UINT64_TYPE__ uint64_t; typedef __UINTMAX_TYPE__ uintmax_t; #define L "Make Clang produce an error" #define LL "Make Clang produce an error" #define U "Make Clang produce an error" #define UL "Make Clang produce an error" #define ULL "Make Clang produce an error" int main(int argc, char **argv) { (void)argc; (void)argv; int8_t a = INT8_C (127); int16_t b = INT16_C (32767); int32_t c = INT32_C (2147483647); int64_t d = INT64_C (9223372036854775807); intmax_t e = INTMAX_C (9223372036854775807); uint8_t f = UINT8_C (255); uint16_t g = UINT16_C (65535); uint32_t h = UINT32_C (4294967295); uint64_t i = UINT64_C (18446744073709551615); uintmax_t j = UINTMAX_C(18446744073709551615); (void)a; (void)b; (void)c; (void)d; (void)e; (void)f; (void)g; (void)h; (void)i; (void)j; return 0; } ```
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‎clang/docs/ReleaseNotes.rst‎

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Original file line numberDiff line numberDiff line change
@@ -479,6 +479,17 @@ Non-comprehensive list of changes in this release
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``__builtin_elementwise_sub_sat``, ``__builtin_reduce_min`` (For integral element type),
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``__builtin_reduce_max`` (For integral element type).
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482+
- The builtin macros ``__INT8_C``, ``__INT16_C``, ``__INT32_C``, ``__INT64_C``,
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``__INTMAX_C``, ``__UINT8_C``, ``__UINT16_C``, ``__UINT32_C``, ``__UINT64_C``
484+
and ``__UINTMAX_C`` have been introduced to ease the implementaton of section
485+
7.18.4 of ISO/IEC 9899:1999. These macros are also defined by GCC and should
486+
be used instead of others that expand and paste the suffixes provided by
487+
``__INT8_C_SUFFIX__``, ``__INT16_C_SUFFIX__``, ``__INT32_C_SUFFIX__``,
488+
``__INT64_C_SUFFIX__``, ``__INTMAX_C_SUFFIX__``, ``__UINT8_C_SUFFIX__``,
489+
``__UINT16_C_SUFFIX__``, ``__UINT32_C_SUFFIX__``, ``__UINT64_C_SUFFIX__`` and
490+
``__UINTMAX_C_SUFFIX__``. Pasting suffixes after the expansion of their
491+
respective macros is unsafe, as users can define the suffixes as macros.
492+
482493
- Clang now rejects ``_BitInt`` matrix element types if the bit width is less than ``CHAR_WIDTH`` or
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not a power of two, matching preexisting behaviour for vector types.
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‎clang/lib/Frontend/InitPreprocessor.cpp‎

Lines changed: 10 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -253,6 +253,8 @@ static void DefineExactWidthIntType(const LangOptions &LangOpts,
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254254
StringRef ConstSuffix(TI.getTypeConstantSuffix(Ty));
255255
Builder.defineMacro(Prefix + Twine(TypeWidth) + "_C_SUFFIX__", ConstSuffix);
256+
Builder.defineMacro(Prefix + Twine(TypeWidth) + "_C(c)",
257+
ConstSuffix.size() ? Twine("c##") + ConstSuffix : "c");
256258
}
257259

258260
static void DefineExactWidthIntTypeSize(TargetInfo::IntType Ty,
@@ -1164,12 +1166,16 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
11641166

11651167
DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder);
11661168
DefineFmt(LangOpts, "__INTMAX", TI.getIntMaxType(), TI, Builder);
1167-
Builder.defineMacro("__INTMAX_C_SUFFIX__",
1168-
TI.getTypeConstantSuffix(TI.getIntMaxType()));
1169+
StringRef ConstSuffix(TI.getTypeConstantSuffix(TI.getIntMaxType()));
1170+
Builder.defineMacro("__INTMAX_C_SUFFIX__", ConstSuffix);
1171+
Builder.defineMacro("__INTMAX_C(c)",
1172+
ConstSuffix.size() ? Twine("c##") + ConstSuffix : "c");
11691173
DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder);
11701174
DefineFmt(LangOpts, "__UINTMAX", TI.getUIntMaxType(), TI, Builder);
1171-
Builder.defineMacro("__UINTMAX_C_SUFFIX__",
1172-
TI.getTypeConstantSuffix(TI.getUIntMaxType()));
1175+
ConstSuffix = TI.getTypeConstantSuffix(TI.getUIntMaxType());
1176+
Builder.defineMacro("__UINTMAX_C_SUFFIX__", ConstSuffix);
1177+
Builder.defineMacro("__UINTMAX_C(c)",
1178+
ConstSuffix.size() ? Twine("c##") + ConstSuffix : "c");
11731179
DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(LangAS::Default), Builder);
11741180
DefineFmt(LangOpts, "__PTRDIFF", TI.getPtrDiffType(LangAS::Default), TI,
11751181
Builder);

‎clang/test/Preprocessor/init-aarch64.c‎

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Original file line numberDiff line numberDiff line change
@@ -135,26 +135,31 @@
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// AARCH64_CXX-NEXT: #define __GLIBCXX_BITSIZE_INT_N_0 128
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// AARCH64_CXX-NEXT: #define __GLIBCXX_TYPE_INT_N_0 __int128
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// AARCH64-NEXT: #define __HAVE_FUNCTION_MULTI_VERSIONING 1
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// AARCH64-NEXT: #define __INT16_C(c) c
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// AARCH64-NEXT: #define __INT16_C_SUFFIX__
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// AARCH64-NEXT: #define __INT16_FMTd__ "hd"
140141
// AARCH64-NEXT: #define __INT16_FMTi__ "hi"
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// AARCH64-NEXT: #define __INT16_MAX__ 32767
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// AARCH64-NEXT: #define __INT16_TYPE__ short
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// AARCH64-NEXT: #define __INT32_C(c) c
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// AARCH64-NEXT: #define __INT32_C_SUFFIX__
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// AARCH64-NEXT: #define __INT32_FMTd__ "d"
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// AARCH64-NEXT: #define __INT32_FMTi__ "i"
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// AARCH64-NEXT: #define __INT32_MAX__ 2147483647
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// AARCH64-NEXT: #define __INT32_TYPE__ int
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// AARCH64-NEXT: #define __INT64_C(c) c##L
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// AARCH64-NEXT: #define __INT64_C_SUFFIX__ L
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// AARCH64-NEXT: #define __INT64_FMTd__ "ld"
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// AARCH64-NEXT: #define __INT64_FMTi__ "li"
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// AARCH64-NEXT: #define __INT64_MAX__ 9223372036854775807L
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// AARCH64-NEXT: #define __INT64_TYPE__ long int
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// AARCH64-NEXT: #define __INT8_C(c) c
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// AARCH64-NEXT: #define __INT8_C_SUFFIX__
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// AARCH64-NEXT: #define __INT8_FMTd__ "hhd"
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// AARCH64-NEXT: #define __INT8_FMTi__ "hhi"
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// AARCH64-NEXT: #define __INT8_MAX__ 127
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// AARCH64-NEXT: #define __INT8_TYPE__ signed char
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// AARCH64-NEXT: #define __INTMAX_C(c) c##L
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// AARCH64-NEXT: #define __INTMAX_C_SUFFIX__ L
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// AARCH64-NEXT: #define __INTMAX_FMTd__ "ld"
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// AARCH64-NEXT: #define __INTMAX_FMTi__ "li"
@@ -287,34 +292,39 @@
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// AARCH64-NEXT: #define __STDC_UTF_32__ 1
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// AARCH64_C: #define __STDC_VERSION__ 201710L
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// AARCH64-NEXT: #define __STDC__ 1
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// AARCH64-NEXT: #define __UINT16_C(c) c
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// AARCH64-NEXT: #define __UINT16_C_SUFFIX__
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// AARCH64-NEXT: #define __UINT16_FMTX__ "hX"
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// AARCH64-NEXT: #define __UINT16_FMTo__ "ho"
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// AARCH64-NEXT: #define __UINT16_FMTu__ "hu"
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// AARCH64-NEXT: #define __UINT16_FMTx__ "hx"
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// AARCH64-NEXT: #define __UINT16_MAX__ 65535
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// AARCH64-NEXT: #define __UINT16_TYPE__ unsigned short
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// AARCH64-NEXT: #define __UINT32_C(c) c##U
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// AARCH64-NEXT: #define __UINT32_C_SUFFIX__ U
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// AARCH64-NEXT: #define __UINT32_FMTX__ "X"
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// AARCH64-NEXT: #define __UINT32_FMTo__ "o"
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// AARCH64-NEXT: #define __UINT32_FMTu__ "u"
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// AARCH64-NEXT: #define __UINT32_FMTx__ "x"
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// AARCH64-NEXT: #define __UINT32_MAX__ 4294967295U
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// AARCH64-NEXT: #define __UINT32_TYPE__ unsigned int
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// AARCH64-NEXT: #define __UINT64_C(c) c##UL
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// AARCH64-NEXT: #define __UINT64_C_SUFFIX__ UL
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// AARCH64-NEXT: #define __UINT64_FMTX__ "lX"
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// AARCH64-NEXT: #define __UINT64_FMTo__ "lo"
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// AARCH64-NEXT: #define __UINT64_FMTu__ "lu"
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// AARCH64-NEXT: #define __UINT64_FMTx__ "lx"
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// AARCH64-NEXT: #define __UINT64_MAX__ 18446744073709551615UL
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// AARCH64-NEXT: #define __UINT64_TYPE__ long unsigned int
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// AARCH64-NEXT: #define __UINT8_C(c) c
311320
// AARCH64-NEXT: #define __UINT8_C_SUFFIX__
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// AARCH64-NEXT: #define __UINT8_FMTX__ "hhX"
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// AARCH64-NEXT: #define __UINT8_FMTo__ "hho"
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// AARCH64-NEXT: #define __UINT8_FMTu__ "hhu"
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// AARCH64-NEXT: #define __UINT8_FMTx__ "hhx"
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// AARCH64-NEXT: #define __UINT8_MAX__ 255
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// AARCH64-NEXT: #define __UINT8_TYPE__ unsigned char
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// AARCH64-NEXT: #define __UINTMAX_C(c) c##UL
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// AARCH64-NEXT: #define __UINTMAX_C_SUFFIX__ UL
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// AARCH64-NEXT: #define __UINTMAX_FMTX__ "lX"
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// AARCH64-NEXT: #define __UINTMAX_FMTo__ "lo"
@@ -435,26 +445,31 @@
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// AARCH64-DARWIN: #define __FLT_MIN__ 1.17549435e-38F
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// AARCH64-DARWIN: #define __FLT_RADIX__ 2
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// AARCH64-DARWIN: #define __FUNCTION_MULTI_VERSIONING_SUPPORT_LEVEL 202430
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// AARCH64-DARWIN: #define __INT16_C(c) c
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// AARCH64-DARWIN: #define __INT16_C_SUFFIX__
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// AARCH64-DARWIN: #define __INT16_FMTd__ "hd"
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// AARCH64-DARWIN: #define __INT16_FMTi__ "hi"
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// AARCH64-DARWIN: #define __INT16_MAX__ 32767
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// AARCH64-DARWIN: #define __INT16_TYPE__ short
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// AARCH64-DARWIN: #define __INT32_C(c) c
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// AARCH64-DARWIN: #define __INT32_C_SUFFIX__
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// AARCH64-DARWIN: #define __INT32_FMTd__ "d"
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// AARCH64-DARWIN: #define __INT32_FMTi__ "i"
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// AARCH64-DARWIN: #define __INT32_MAX__ 2147483647
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// AARCH64-DARWIN: #define __INT32_TYPE__ int
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// AARCH64-DARWIN: #define __INT64_C(c) c##LL
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// AARCH64-DARWIN: #define __INT64_C_SUFFIX__ LL
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// AARCH64-DARWIN: #define __INT64_FMTd__ "lld"
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// AARCH64-DARWIN: #define __INT64_FMTi__ "lli"
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// AARCH64-DARWIN: #define __INT64_MAX__ 9223372036854775807LL
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// AARCH64-DARWIN: #define __INT64_TYPE__ long long int
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// AARCH64-DARWIN: #define __INT8_C(c) c
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// AARCH64-DARWIN: #define __INT8_C_SUFFIX__
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// AARCH64-DARWIN: #define __INT8_FMTd__ "hhd"
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// AARCH64-DARWIN: #define __INT8_FMTi__ "hhi"
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// AARCH64-DARWIN: #define __INT8_MAX__ 127
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// AARCH64-DARWIN: #define __INT8_TYPE__ signed char
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// AARCH64-DARWIN: #define __INTMAX_C(c) c##L
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// AARCH64-DARWIN: #define __INTMAX_C_SUFFIX__ L
459474
// AARCH64-DARWIN: #define __INTMAX_FMTd__ "ld"
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// AARCH64-DARWIN: #define __INTMAX_FMTi__ "li"
@@ -538,18 +553,23 @@
538553
// AARCH64-DARWIN: #define __SIZE_MAX__ 18446744073709551615UL
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// AARCH64-DARWIN: #define __SIZE_TYPE__ long unsigned int
540555
// AARCH64-DARWIN: #define __SIZE_WIDTH__ 64
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// AARCH64-DARWIN: #define __UINT16_C(c) c
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// AARCH64-DARWIN: #define __UINT16_C_SUFFIX__
542558
// AARCH64-DARWIN: #define __UINT16_MAX__ 65535
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// AARCH64-DARWIN: #define __UINT16_TYPE__ unsigned short
560+
// AARCH64-DARWIN: #define __UINT32_C(c) c##U
544561
// AARCH64-DARWIN: #define __UINT32_C_SUFFIX__ U
545562
// AARCH64-DARWIN: #define __UINT32_MAX__ 4294967295U
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// AARCH64-DARWIN: #define __UINT32_TYPE__ unsigned int
564+
// AARCH64-DARWIN: #define __UINT64_C(c) c##ULL
547565
// AARCH64-DARWIN: #define __UINT64_C_SUFFIX__ ULL
548566
// AARCH64-DARWIN: #define __UINT64_MAX__ 18446744073709551615ULL
549567
// AARCH64-DARWIN: #define __UINT64_TYPE__ long long unsigned int
568+
// AARCH64-DARWIN: #define __UINT8_C(c) c
550569
// AARCH64-DARWIN: #define __UINT8_C_SUFFIX__
551570
// AARCH64-DARWIN: #define __UINT8_MAX__ 255
552571
// AARCH64-DARWIN: #define __UINT8_TYPE__ unsigned char
572+
// AARCH64-DARWIN: #define __UINTMAX_C(c) c##UL
553573
// AARCH64-DARWIN: #define __UINTMAX_C_SUFFIX__ UL
554574
// AARCH64-DARWIN: #define __UINTMAX_MAX__ 18446744073709551615UL
555575
// AARCH64-DARWIN: #define __UINTMAX_TYPE__ long unsigned int
@@ -703,18 +723,23 @@
703723
// AARCH64-MSVC: #define __STDC_UTF_32__ 1
704724
// AARCH64-MSVC: #define __STDC_VERSION__ 201710L
705725
// AARCH64-MSVC: #define __STDC__ 1
726+
// AARCH64-MSVC: #define __UINT16_C(c) c
706727
// AARCH64-MSVC: #define __UINT16_C_SUFFIX__
707728
// AARCH64-MSVC: #define __UINT16_MAX__ 65535
708729
// AARCH64-MSVC: #define __UINT16_TYPE__ unsigned short
730+
// AARCH64-MSVC: #define __UINT32_C(c) c##U
709731
// AARCH64-MSVC: #define __UINT32_C_SUFFIX__ U
710732
// AARCH64-MSVC: #define __UINT32_MAX__ 4294967295U
711733
// AARCH64-MSVC: #define __UINT32_TYPE__ unsigned int
734+
// AARCH64-MSVC: #define __UINT64_C(c) c##ULL
712735
// AARCH64-MSVC: #define __UINT64_C_SUFFIX__ ULL
713736
// AARCH64-MSVC: #define __UINT64_MAX__ 18446744073709551615ULL
714737
// AARCH64-MSVC: #define __UINT64_TYPE__ long long unsigned int
738+
// AARCH64-MSVC: #define __UINT8_C(c) c
715739
// AARCH64-MSVC: #define __UINT8_C_SUFFIX__
716740
// AARCH64-MSVC: #define __UINT8_MAX__ 255
717741
// AARCH64-MSVC: #define __UINT8_TYPE__ unsigned char
742+
// AARCH64-MSVC: #define __UINTMAX_C(c) c##ULL
718743
// AARCH64-MSVC: #define __UINTMAX_C_SUFFIX__ ULL
719744
// AARCH64-MSVC: #define __UINTMAX_MAX__ 18446744073709551615ULL
720745
// AARCH64-MSVC: #define __UINTMAX_TYPE__ long long unsigned int
@@ -867,26 +892,31 @@
867892
// ARM64EC-MSVC: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
868893
// ARM64EC-MSVC: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
869894
// ARM64EC-MSVC: #define __HAVE_FUNCTION_MULTI_VERSIONING 1
895+
// ARM64EC-MSVC: #define __INT16_C(c) c
870896
// ARM64EC-MSVC: #define __INT16_C_SUFFIX__
871897
// ARM64EC-MSVC: #define __INT16_FMTd__ "hd"
872898
// ARM64EC-MSVC: #define __INT16_FMTi__ "hi"
873899
// ARM64EC-MSVC: #define __INT16_MAX__ 32767
874900
// ARM64EC-MSVC: #define __INT16_TYPE__ short
901+
// ARM64EC-MSVC: #define __INT32_C(c) c
875902
// ARM64EC-MSVC: #define __INT32_C_SUFFIX__
876903
// ARM64EC-MSVC: #define __INT32_FMTd__ "d"
877904
// ARM64EC-MSVC: #define __INT32_FMTi__ "i"
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// ARM64EC-MSVC: #define __INT32_MAX__ 2147483647
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// ARM64EC-MSVC: #define __INT32_TYPE__ int
907+
// ARM64EC-MSVC: #define __INT64_C(c) c##LL
880908
// ARM64EC-MSVC: #define __INT64_C_SUFFIX__ LL
881909
// ARM64EC-MSVC: #define __INT64_FMTd__ "lld"
882910
// ARM64EC-MSVC: #define __INT64_FMTi__ "lli"
883911
// ARM64EC-MSVC: #define __INT64_MAX__ 9223372036854775807LL
884912
// ARM64EC-MSVC: #define __INT64_TYPE__ long long int
913+
// ARM64EC-MSVC: #define __INT8_C(c) c
885914
// ARM64EC-MSVC: #define __INT8_C_SUFFIX__
886915
// ARM64EC-MSVC: #define __INT8_FMTd__ "hhd"
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// ARM64EC-MSVC: #define __INT8_FMTi__ "hhi"
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// ARM64EC-MSVC: #define __INT8_MAX__ 127
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// ARM64EC-MSVC: #define __INT8_TYPE__ signed char
919+
// ARM64EC-MSVC: #define __INTMAX_C(c) c##LL
890920
// ARM64EC-MSVC: #define __INTMAX_C_SUFFIX__ LL
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// ARM64EC-MSVC: #define __INTMAX_FMTd__ "lld"
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// ARM64EC-MSVC: #define __INTMAX_FMTi__ "lli"
@@ -1013,34 +1043,39 @@
10131043
// ARM64EC-MSVC: #define __STDC_UTF_32__ 1
10141044
// ARM64EC-MSVC: #define __STDC_VERSION__ 201710L
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// ARM64EC-MSVC: #define __STDC__ 1
1046+
// ARM64EC-MSVC: #define __UINT16_C(c) c
10161047
// ARM64EC-MSVC: #define __UINT16_C_SUFFIX__
10171048
// ARM64EC-MSVC: #define __UINT16_FMTX__ "hX"
10181049
// ARM64EC-MSVC: #define __UINT16_FMTo__ "ho"
10191050
// ARM64EC-MSVC: #define __UINT16_FMTu__ "hu"
10201051
// ARM64EC-MSVC: #define __UINT16_FMTx__ "hx"
10211052
// ARM64EC-MSVC: #define __UINT16_MAX__ 65535
10221053
// ARM64EC-MSVC: #define __UINT16_TYPE__ unsigned short
1054+
// ARM64EC-MSVC: #define __UINT32_C(c) c##U
10231055
// ARM64EC-MSVC: #define __UINT32_C_SUFFIX__ U
10241056
// ARM64EC-MSVC: #define __UINT32_FMTX__ "X"
10251057
// ARM64EC-MSVC: #define __UINT32_FMTo__ "o"
10261058
// ARM64EC-MSVC: #define __UINT32_FMTu__ "u"
10271059
// ARM64EC-MSVC: #define __UINT32_FMTx__ "x"
10281060
// ARM64EC-MSVC: #define __UINT32_MAX__ 4294967295U
10291061
// ARM64EC-MSVC: #define __UINT32_TYPE__ unsigned int
1062+
// ARM64EC-MSVC: #define __UINT64_C(c) c##ULL
10301063
// ARM64EC-MSVC: #define __UINT64_C_SUFFIX__ ULL
10311064
// ARM64EC-MSVC: #define __UINT64_FMTX__ "llX"
10321065
// ARM64EC-MSVC: #define __UINT64_FMTo__ "llo"
10331066
// ARM64EC-MSVC: #define __UINT64_FMTu__ "llu"
10341067
// ARM64EC-MSVC: #define __UINT64_FMTx__ "llx"
10351068
// ARM64EC-MSVC: #define __UINT64_MAX__ 18446744073709551615ULL
10361069
// ARM64EC-MSVC: #define __UINT64_TYPE__ long long unsigned int
1070+
// ARM64EC-MSVC: #define __UINT8_C(c) c
10371071
// ARM64EC-MSVC: #define __UINT8_C_SUFFIX__
10381072
// ARM64EC-MSVC: #define __UINT8_FMTX__ "hhX"
10391073
// ARM64EC-MSVC: #define __UINT8_FMTo__ "hho"
10401074
// ARM64EC-MSVC: #define __UINT8_FMTu__ "hhu"
10411075
// ARM64EC-MSVC: #define __UINT8_FMTx__ "hhx"
10421076
// ARM64EC-MSVC: #define __UINT8_MAX__ 255
10431077
// ARM64EC-MSVC: #define __UINT8_TYPE__ unsigned char
1078+
// ARM64EC-MSVC: #define __UINTMAX_C(c) c##ULL
10441079
// ARM64EC-MSVC: #define __UINTMAX_C_SUFFIX__ ULL
10451080
// ARM64EC-MSVC: #define __UINTMAX_FMTX__ "llX"
10461081
// ARM64EC-MSVC: #define __UINTMAX_FMTo__ "llo"

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